[PATCH] scsi: iscsi_tcp: restrict to TCP sockets

[Eric Dumazet]

Nothing prevents iscsi_sw_tcp_conn_bind() to receive file descriptor
pointing to non TCP socket (af_unix for example).

Return -EINVAL if this is attempted, instead of crashing the kernel.

Fixes: 7ba247138907 ("[SCSI] open-iscsi/linux-iscsi-5 Initiator: Initiator code")
Signed-off-by: Eric Dumazet <edum...@google.com>
Cc: Lee Duncan <ldu...@suse.com>
Cc: Chris Leech <cle...@redhat.com>
Cc: Mike Christie <michael....@oracle.com>
Cc: "James E.J. Bottomley" <je...@linux.ibm.com>
Cc: "Martin K. Petersen" <martin....@oracle.com>
Cc: open-...@googlegroups.com
Cc: linux...@vger.kernel.org
---
drivers/scsi/iscsi_tcp.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 9ab8555180a3a0bd159b621a57c99bcb8f0413ae..8e14cea15f980829e99afa2c43bf6872fcfd965c 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -724,6 +724,10 @@ iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session,
return -EEXIST;
}

+ err = -EINVAL;
+ if (!sk_is_tcp(sock->sk))
+ goto free_socket;
+
err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
if (err)
goto free_socket;
--
2.42.0.459.ge4e396fd5e-goog

[Mike Christie]

On 9/15/23 12:11 PM, Eric Dumazet wrote:
> Nothing prevents iscsi_sw_tcp_conn_bind() to receive file descriptor
> pointing to non TCP socket (af_unix for example).
>
> Return -EINVAL if this is attempted, instead of crashing the kernel.
>

Reviewed-by: Mike Christie <michael....@oracle.com>

[patchwork-b...@kernel.org]

Hello:

This patch was applied to netdev/net.git (main)
by David S. Miller <da...@davemloft.net>:

On Fri, 15 Sep 2023 17:11:11 +0000 you wrote:
> Nothing prevents iscsi_sw_tcp_conn_bind() to receive file descriptor
> pointing to non TCP socket (af_unix for example).
>
> Return -EINVAL if this is attempted, instead of crashing the kernel.
>
> Fixes: 7ba247138907 ("[SCSI] open-iscsi/linux-iscsi-5 Initiator: Initiator code")
> Signed-off-by: Eric Dumazet <edum...@google.com>
> Cc: Lee Duncan <ldu...@suse.com>
> Cc: Chris Leech <cle...@redhat.com>
> Cc: Mike Christie <michael....@oracle.com>
> Cc: "James E.J. Bottomley" <je...@linux.ibm.com>
> Cc: "Martin K. Petersen" <martin....@oracle.com>
> Cc: open-...@googlegroups.com
> Cc: linux...@vger.kernel.org
>

> [...]

Here is the summary with links:
- scsi: iscsi_tcp: restrict to TCP sockets
https://git.kernel.org/netdev/net/c/f4f82c52a0ea

You are awesome, thank you!
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